Fire is not reaching to the flashover

[mohamedabdelwahed88]

Hi All,

I performed a simulation to pool fire inside a standard dimensioned room. Still, I noticed that the maximum temperature in the upper layer is less than 500 °C, indicating that the fire is not reaching flashover. I re-simulate the fire after changing the design fire details, but unfortunately, with the same results. Any ideas about this issue, and why it did not reach the flashover case?

[drjfloyd]

to small a fire, to high a lower oxygen limit, not enough ventilation, ..... there are many possible reasons. CFAST outputs a lot of data related to oxygen, the requested vs. actual fire size, heat loss to walls, etc.. What reasons have you considered and what does the data from CFAST tell you?

[mohamedabdelwahed88]

I have considered a pool fire inside a standard room, including one door and one window. Oxygen limitation was 15%

[drjfloyd]

Have you looked at the CFAST output files? What do they tell is happening in your simulation?

[mohamedabdelwahed88]

I have checked all files, and there is no clear idea that
iBMB Compartment_compartments.csv
was concluded. If possible, I attach a copy from the output file for your review.
iBMB Compartment_devices.csv
iBMB Compartment_vents.csv
iBMB Compartment_walls.xlsx
iBMB Compartment_zone.csv

[drjfloyd]

Look at temperature

See how it spikes up and quickly drops off. This should clue you in that for some reason you have no fire after the first few seconds of the simulation.

Now look at the data for the fire size.

These are the fire you specified and the fire that actually happened in the compartment (it might be less if you don't have enough O2). Note that curves lies on top of one another. You are getting the fire that you input. This should point you towards looking at the inputs for your fire and making sure they are correct.

[mohamedabdelwahed88]

Thanks a lot. I will check it.